Not to but in again... but do you even understand the product you are selling? Crossdrilling was never done for better braking and slotting is done to help keep your pads consistent when they get hot. That is just bad/wrong information. I am sure your brand new slotted and drilled rotor will stop better than my old blank rotor, but give me a new blank rotor agains a new slotted/drilled and I garruntee the stopping distance will be the same, if not better for the blank.